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Full text of "The Morphology And Evolution Of The Apes And Man"

CIRCULATION, BLOOD AND GLANDS       235
investigation permits of our drawing certain definite conclusions. It is a remarkable fact, as I stated on a former occasion with regard to mv results with the
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Anthropoidea—and this applies as well to other groups of animals—that a common property has persisted in the bloods of certain groups of animals throughout the ages which have elapsed during their evolution from a common ancestor, and this in spite of differences of food and habits of life."
The precipitin test is carried out as follows: A rabbit receives at intervals five or six intravenous injections of 5 c.c. of human blood serum. Seven to twelve davs after
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the last injection it is killed and bled. The blood is allowed to coagulate, and the serum is collected and stored in small tubes with sealed ends. A few drops of chloroform are added to each for preserving purposes* As human blood serum is used for injections the rabbit serum is known as an anti-human serum, but anti-chimpanzee, anti-orang, anti-fowl and other sera are also prepared in a similar way. If fresh human serum is added to one of the tubes a thick precipitate is thrown down; and if the sera of the animals closely related to Man are added to successive tubes a precipitate is formed, but it is not so thick. Similarly an anti-chimpanzee serum yields a precipitate if the blood of Man and the other Anthropoids is added to it. After carrying out some hundreds of tests, Nuttall came to the following conclusions: (1) There is a close relationship between the Hominidse and Simiidse, and a more distant relationship with the Cercopithecidse; (2) the bloods of the Cebidse and Hapalidse give poor reactions with those of the preceding families; (3) the anti-sera for all the